Re: [PATCH net] net: vrf: Remove direct access to skb->data

[David Miller]

From: David Ahern 
Date: Tue, 23 Feb 2016 10:10:26 -0800

> Nik pointed that the VRF driver should be using skb_header_pointer
> instead of accessing skb->data and bits beyond directly which can
> be garbage.
> 
> Cc: Nikolay Aleksandrov 
> Signed-off-by: David Ahern 
> ---
> Dave: This should go into v4.4 stable as well.

Applied and queued up for -stable, thanks.

Re: [PATCH net] net: vrf: Remove direct access to skb->data

[Nikolay Aleksandrov]

On 02/23/2016 07:10 PM, David Ahern wrote:
> Nik pointed that the VRF driver should be using skb_header_pointer
> instead of accessing skb->data and bits beyond directly which can
> be garbage.
> 
> Cc: Nikolay Aleksandrov 
> Signed-off-by: David Ahern 
> ---
> Dave: This should go into v4.4 stable as well.
> 
>  drivers/net/vrf.c | 13 -
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 

Thanks for the quick fix,

Fixes: 35402e313663 ("net: Add IPv6 support to VRF device")

Signed-off-by: Nikolay Aleksandrov 

[PATCH net] net: vrf: Remove direct access to skb->data

[David Ahern]

Nik pointed that the VRF driver should be using skb_header_pointer
instead of accessing skb->data and bits beyond directly which can
be garbage.

Cc: Nikolay Aleksandrov 
Signed-off-by: David Ahern 
---
Dave: This should go into v4.4 stable as well.

 drivers/net/vrf.c | 13 -
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 9ce088bb28ab..9a9fabb900c1 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -103,20 +103,23 @@ static struct dst_ops vrf_dst_ops = {
 #if IS_ENABLED(CONFIG_IPV6)
 static bool check_ipv6_frame(const struct sk_buff *skb)
 {
-   const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data;
-   size_t hlen = sizeof(*ipv6h);
+   const struct ipv6hdr *ipv6h;
+   struct ipv6hdr _ipv6h;
bool rc = true;
 
-   if (skb->len < hlen)
+   ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h);
+   if (!ipv6h)
goto out;
 
if (ipv6h->nexthdr == NEXTHDR_ICMP) {
const struct icmp6hdr *icmph;
+   struct icmp6hdr _icmph;
 
-   if (skb->len < hlen + sizeof(*icmph))
+   icmph = skb_header_pointer(skb, sizeof(_ipv6h),
+  sizeof(_icmph), &_icmph);
+   if (!icmph)
goto out;
 
-   icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h));
switch (icmph->icmp6_type) {
case NDISC_ROUTER_SOLICITATION:
case NDISC_ROUTER_ADVERTISEMENT:
-- 
2.1.4